Google has announced to its Google Glass testers that they may invite one friend to try out Glass for themselves, through the Glass Explorer Program.

This somewhat emulates when Google first launched GMail, which if you may recall was initially also invite only. Although this time around the amount of invites is limited to one invite per tester, it does make current Glass users that much more important within their circle of friends.

There are a few catches however, as noted above -anyone applying to the Glass Explorer Program must be a resident of the US, over 18 and be able to personally pick up Glass in San Francisco, New York or Los Angeles; making it perhaps pretty limited even for those already living in the States. There's also no indication that the pricing has been changed to accommodate this program, meaning it's probably going to cost those Explorers the same $1500 to take part.